# How to find out point of change of sequence of ones and zeros?

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Lukas Poviser 2021년 7월 27일
댓글: Lukas Poviser 2021년 7월 28일
Hello,
I have this matrice:
1 NaN 3.28000000000000
1 NaN 3.32000000000000
1 NaN 3.36000000000000
1 NaN 3.40000000000000
0 0.0320040000000000 3.44000000000000
0 0.0697230000000000 3.48000000000000
0 0.124815600000000 3.52000000000000
0 0.158877000000000 3.56000000000000
and I would like to have another column where would be just the number where the first column changes from 1 to 0.
Result should be like this:
1 NaN 3.28000000000000
1 NaN 3.32000000000000
1 NaN 3.36000000000000
1 NaN 3.40000000000000 3.40000000000000
0 0.0320040000000000 3.44000000000000
0 0.0697230000000000 3.48000000000000
0 0.124815600000000 3.52000000000000
0 0.158877000000000 3.56000000000000

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### 채택된 답변

Jan 2021년 7월 27일
편집: Jan 2021년 7월 28일
What do you expect in the other rows of the 4th column? All rows must have the same number of columns, according to the definition of a matrix. If zeros are fine:
index = find(A(:, 1) == 0, 1) - 1; % [EDITED, -1 appended]
if any(index)
A(index, 4) = A(index, 3);
end
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Lukas Poviser 2021년 7월 28일
It works perfectly! Thanks!

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R2020b

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